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[論文] 유선형스텝에 의해 안정화된 예혼합 화염의 구조와 연소특성에 관한 연구(I) (접근류의 압력맥동의 영향에 대하여)
이재득(J. D. Lee),최병륜(B. R. Choi) 한국자동차공학회 1990 오토저널 Vol.12 No.3
In a premixed flame stabilized by a streamlined step, the flame structure and combustion characteristics were investigated to identify the effect of the pressure pulsation in a combustion air. A flame stabilizing limits, visualization, mean temperature, ion current and gas concentration (0₂, CO₂, CO, UHC) were measured. With the combustion air of higher pressure pulsation, the development of the mixing layer was fast and wide, the temperature and combustion intensity were higher at arbitary section. But, the effect was notably decreased with X=150 mm downstream. And a first eddy formation from step edge was earlier. Thus, with the combustion air of higher pressure pulsation, high rate of heat generation was expected.
전도 냉각을 이용한 고온 초전도 회전기용 모델 코일의 특성 평가
이재득(J. D. Lee),백승규(S. K. Baik),손명환(M. H. Sohn),이언용(E. Y. Lee),김영춘(Y. C. Kim),권영길(Y. K. Kwon),박민원(M. W. Park),유인근(I. K. Yu) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
In large scale superconducting rotating machine, HTS field coils are constructed with many stacks of single or double pancake coils connected in series. In spite of its higher thermal stability, HTS field coil experiences some quench, which results in some part of bum-out in the field coils. Thus in the view point of the HTS rotating machine field coil design and testing, it was very important to predict the possibility of quench occurrence in the designed field coils. In this paper, a HTS racetrack coil constructed with two single pancake coils and one double pancake coil was tested in LN2 and cooling by GM refrigerator. It is wound using the Bi-2223 tape. The experimental details and results are presented in this paper.
3차원 자장 해석을 통한 1㎿ 급 고온초전도 모터의 특성 해석
백승규(S. K. Baik),손명환(M. H. Sohn),이재득(J. D. Lee),이언용(E. Y. Lee),권영길(Y. K. Kwon),문태선(T. S. Moon),박희주(H. J. Park),김영춘(Y. C. Kim),박관수(G. S. Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Different from the conventional motor, the superconducting motor has so large air-gap that the actual parameters such as excitation voltage have considerable difference from the values obtained from 2-dimensional electromagnetic analysis. This paper introduces 3-dimensional EMCN(Equivalent Magnetic Circuit Network) method or FLUX - 3D FEM(Finite Element Method) software to reduce the error originated from the 2-dimensional electromagnetic analysis for the development of a 1 ㎿ class high-temperature superconducting motor.
1㎿ 급 초전도 모터용 고온초전도 계자코일의 전자기적 특성
백승규(S. K. Baik),손명환(M. H. Sohn),이재득(J. D. Lee),이언용(E. Y. Lee),권영길(Y. K. Kwon),문태선(T. S. Moon),박희주(H. J. Park),김영춘(Y. C. Kim),박관수(G. S. Park) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
On the contrary of a conventional motor with very narrow air-gap, it is difficult to calculate the accurate magnetic field distribution and the performance of an air-cored superconducting motor by 2 dimensional analysis, which does not use high permeability material except outer machine shield. This paper aims to do analysis of magnetic field and force distribution from the 3 dimensional modelling of a 1㎿ class superconducting synchronous motor. Especially, the field coil composed of Bi-2223 high-temperature superconductor and the outer machine shield are modelled by finite element analysis software according to their structures and the self-inductance and Lorentz force are calculated based on the 3 dimensional magnetic field calculation.